Zen is the meditation school of Japanese Buddhism,Zen is a transliteration of the Chinese word chan,Which is itself an abbreviation of chan-na, From the Sanskrit word dhyana,Meaning meditation, or absolute stillness of the mind.

If the heart is in accord with what is,All single strivings have ceased,All doubts are cleared up,True faith is confirmed;Nothing remains,Nothing need be remembered.Empty, clear, self-illuminating,The heart does not waste its energy.- Sosan The Third Zen Patriarch